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Smart Structures and Systems Volume 5, Number 4, July 2009 , pages 329-344 DOI: https://doi.org/10.12989/sss.2009.5.4.329 |
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Damage state evaluation of experimental and simulated bolted joints using chaotic ultrasonic waves |
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T. R. Fasel, M. B. Kennel,M. D. Todd, E. H. Clayton and G. Park
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| Abstract | ||
| Ultrasonic chaotic excitations combined with sensor prediction algorithms have shown the ability to identify incipient damage (loss of preload) in a bolted joint. In this study we examine a physical experiment on a single-bolt aluminum lap joint as well as a three-dimensional physics-based simulation designed to model the behavior of guided ultrasonic waves through a similarly configured joint. A multiple bolt frame structure is also experimentally examined. In the physical experiment each signal is imparted to the structure through a macro-fiber composite (MFC) patch on one side of the lap joint and sensed using an equivalent MFC patch on the opposite side of the joint. The model applies the waveform via direct nodal displacement and | ||
| Key Words | ||
| structural health monitoring; bolted joint; active sensing; guided waves; AR model; information theory. | ||
| Address | ||
| T. R. Fasel, M. B. Kennel and M. D. Todd; University of California San Diego, La Jolla, CA 92093-0085, U.S.A. E. H. Clayton; Quartus Engineering, San Diego, CA 92121-3771, U.S.A. G. Park; Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A. | ||